Abstract: A motorcycle accident simulating test dummy and method utilizing the test dummy wherein the test dummy includes motorcycle handle bar grips operable to releasably connect the dummy and motorcycle handle bar, frangible limb/joint structure, and a wholly self contained and test dummy protected, accident condition data acquisition unit.

Abstract: Guard-time elimination in a time-division multiplexed, active star-coupled, local area, half-duplex mode, synchronous communications network. Guard time between data packets arriving at the central node of the network is eliminated by adjusting the word slot timing at each terminal such that the data arriving at the central node from each terminal in the network is properly phased with data received from other terminals in the network. The terminal initiallization process required for this timing adjustment is accomplished without disruption of other traffic concurrently being processed through the network.

Abstract: High fidelity combination of low-bulk bass signal reproducer with novel upper range reproducer. Bass reproducer is box whose height, width and depth are each between about 15 and about 21 inches, the bottom of the box being essentially open and fitted with spaced feet on which the box can stand on a pile rug without materially blocking the emergence of sound generated within the box, the top and all sides of the box being essentially imperforate essentially rigid walls which essentially do not transmit sound, and a woofer sound generator mounted within the box. The box can have a generally vertically extending partition that forms a generally vertically extending open-bottomed compartment between 1 and 2 inches thick connected as a duct to conduct and discharge the lowest frequency sounds generated by the woofer.

Abstract: High fidelity combination of low-bulk bass signal reproducer with novel upper range reproducer. Bass reproducer is box whose height, width and depth are each between about 15 and about 21 inches, the interior of the box housing a pair of woofer loudspeakers in face-to-face relation, their cones being linked together and the speakers being inter-connected so that they are dynamically driven in oppositely phased relation, the cone frames having side windows that pass sound generated by the cones, the box having on one side an essentially direct mouth permitting the direct radiation of the sound passed by one speaker frame, and the box also having on a different side a baffled outlet for discharging the sound passed by the other speaker frame through a passive resonator that preferentially passes the lowest frequencies.